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AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS16-100: Security Update for
Secure Boot (3179577)
10 August 2016
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2016-3320
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Microsoft Security Bulletin MS16-100: Security Update for Secure Boot
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow security feature bypass if an attacker installs an
affected boot manager and bypasses Windows security features.
This security update is rated Important for all supported editions of Windows
8.1, Windows Server 2012, Windows Server 2012 R2, Windows RT 8.1, and Windows
Windows Server 2012
Windows Server 2012 R2
Windows RT 8.1 
Windows 10 
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
 This update is only available via Windows Update.
 Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update
Secure Boot Security Feature Bypass Vulnerability - CVE-2016-3320
A security feature bypass vulnerability exists when Windows Secure Boot
improperly loads a boot manager that is affected by the vulnerability. An
attacker who successfully exploited this vulnerability could disable code
integrity checks, allowing test-signed executables and drivers to be loaded
onto a target device. Furthermore, the attacker could bypass Secure Boot
Integrity Validation for BitLocker and Device Encryption security features.
To exploit the vulnerability, an attacker who has gained administrative
privileges or who has physical access to a target device could install an
affected boot manager.The security update addresses the vulnerability by
blacklisting affected boot managers.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Secure Boot Security Feature Bypass Vulnerability CVE-2016-3320 No No
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